code: def test_cupy_input(self):
      test_data = cp.array([[1, 2], [3, 4]], dtype=cp.float32)
      test_data = cp.rot90(test_data)
      self.assertFalse(test_data.flags["C_CONTIGUOUS"])
      result = ToCupy()(test_data)
      self.assertTrue(result.dtype == cp.float32)
      self.assertTrue(isinstance(result, cp.ndarray))
      self.assertTrue(result.flags["C_CONTIGUOUS"])
      cp.testing.assert_allclose(result, test_data)
  
file_path: MONAI/tests/test_to_cupy.py
imports: from __future__ import annotations
  import unittest
  from unittest import skipUnless
  import numpy
  import torch
  from monai.transforms import ToCupy
  from monai.utils import optional_import
  from tests.utils import HAS_CUPY, skip_if_no_cuda
label_desc: Use image node_id 1 for calling the TestToCupy obj's underlying member method code with example usage: obj.test_cupy_input() without return types